Thumbgen is a user-friendly GUI application for creating thumbnail images from larger photos or graphics, developed in C++ Builder 6.0. It allows users to process images with options for resizing and cropping to generate clean, uniform thumbnails. The code structure includes modules for file handling, image manipulation, and a streamlined GUI setup, enabling efficient navigation and thumbnail production. Ideal for media archiving or organizing image collections, Thumbgen simplifies batch thumbnail creation for personal or professional use.